Habib Koite & Bamada 2/20 OLD TOWN SCHOOL OF FOLK MUSIC  Guitarist and singer Habib Koité, a griot’s kid from western Mali, is currently leading his ensemble on a monthlong sweep of U.S. cultural capitals and college towns in support of the new Foly! Live Around the World (World Village).  On the double CD (recorded, despite the title, at shows in Europe) the six-piece band consistently finds its way to a meditative zone, often stretching songs to twice their studio length.